Loud rattling or vibrating noise when the Koldfront air conditioner is running.

Safety first: Turn off and unplug the unit before tightening screws or touching any moving parts.

Steps to reduce the noise:

• 1. Level the unit: Use a level to ensure the unit is properly supported and not twisted within the window or wall sleeve.
• 2. Tighten screws: Check and tighten all accessible mounting screws on the front grille, side panels, and chassis.
• 3. Inspect fan blades: Remove covers to access the indoor and outdoor fan blades. Look for bent blades or debris stuck in the fan. Carefully straighten minor bends and remove any debris.
• 4. Add padding: For through-the-wall units, ensure the chassis fits snugly within the sleeve. Use manufacturer-approved foam strips to reduce rattling.
• 5. Fan motor bearings: If the noise persists and seems to come from the motor itself, the fan motor bearings may be worn, and the motor should be replaced.